Touch pad using tester logic? Answered
I was planning to make a doorbell of which's switch is a touch pad.I tried understanding the logic behind the touch screens used in i phones and such otherd but they seem a bit complicated.Another solution I got was a circuit which has two free wires and when a person touches the two wires(creating contact),the load gets power.This is based on transistor switching.But I don't want to adopt this design since........ I don't know for some reason.Then I remembered those classy electrical testers(seen in the picture).They have a neon bulb in them which glows when they get a voltage of certain range from one end and our body is used as ground when the other end is touched.So if I use this mechanism I just have to use the setting to power the load when a metal plate connected to one end is touched by a 'user'and a voltage is given through the other end.I know these things usually have a neon bulb as they handle AC voltage.Finally here's what I actually need to know-
Is it possible to build such a circuit where a 12 VDC is supplied to one end and the load is given power when the other end meets ground(here the person touching the pad).Maybe this might be a total jabberwocky but anyway contribute your valuable suggestions.If anyone has seen such circuits elsewhere, a schematic could be really helpful.Thank you in advance.